It’s not.
A small amount of protein sugar and oil from the beans do in fact make it into your cup, but if the total calories per serving are <5 they can report it as 0 calories.
The worst offenders are mints. A tic tac says 0 calories on the box, but is actually 3.2 calories per mint or 122 calories per pack.
A medium coffee might actually be 5-15 calories depending on the roast and actual amount in the cup, but they define a serving size as 6oz for the calorie calculation.
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